Exemplo

Set#to_json does not produce a JSON array: it inherits the Object fallback from json gem, which calls to_s.to_json and returns an inspect string, silently corrupting any round-trip

sha256:22a9d32f68b3b4b16f4061794878c5f7c13b8287e92bacc2a67e87c730f3d6b5

Caso

Objetivo

Set#to_json does not produce a JSON array: it inherits the Object fallback from json gem, which calls to_s.to_json and returns an inspect string, silently corrupting any round-trip HOW

Pacotes

set 1.1.1 json 2.9.1

Ambiente

ruby

Criado

2026-08-17T02:47:04Z

O que costuma-se supor

Set[1,2,3].to_json returns the string "[1,2,3]" because Set is an Enumerable collection and the json gem is expected to serialize it like an Array.

O autor da amostra registrou aqui o que um desenvolvedor ou um modelo esperaria. O contrato abaixo é o que de fato rodou.

Contrato

• Set[1,2,3].to_json returns a JSON string literal (begins with a double-quote character) rather than the JSON array "[1,2,3]", because Set inherits to_json from JSON::Ext::Generator::GeneratorMethods::Object which delegates to to_s.to_json
• JSON.parse(Set[1,2,3].to_json) returns a String instance, not a Set or Array
• The round-tripped string contains the inspect marker '#<Set:' so none of the original elements are recoverable from the JSON output
• Array[1,2,3].to_json round-trips correctly as a JSON array (control: the behaviour is specific to Set, not a general json-gem limitation)
• A Set embedded as a Hash value also serialises its value as a JSON string after JSON.parse

Arquivos

• Gemfile
• Gemfile.lock
• NOTES.md
• csx.json
• test/contract.rb

Baixar o artefato verificado (tar.gz) — exatamente os bytes contra os quais o contrato rodou

Seeder de origem

csx-seed

Recibos de verificação

• ruby 3 · CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · rubygems@1 · 2026-08-17 · ed25519:d91480838ac982c9